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Not sure about why the part prefixes are different. I had no trouble buying the exact bearings for my 81 direct from Yamaha using the chart above and the formula from the manual. The part numbers were exact. I double checked with platigauge to make sure the new bearings were right.
New Haven...
Working on the forks now. Springs are perfectly equal length of 498mm, which might be worn down from the stock 502mm, but the spring cross section is also slightly thicker than another pair I have of 500mm.
Top end together and starting to work on the aluminum covers. Also changed the name of his thread from bobber to brat because that is where things are going for now...
Put on your favourite album, grab a beer, and sit down. Cleaning off this liquid gasket from a valve cover took me an hour of careful scraping with a box cutter blade. Try to span across the surface with the whole blade all the time to ensure it does not bite into the aluminum.
Still needs...
In my opinion, it's a fairly involved task that mainly requires patience to do well, especially scraping away the old gasket material. You could do it in a weekend if you have all the parts at hand, and everything cooperates.